Energy Saving Climate Control System

(ESCCS)

Team: Sean Jacobs, Brad Nissenbaum,

Colin Tracy

Advisor: Professor Anderson

Mission Statement

Environmental- Relieving stresses caused by increasing energy

demands

Economic- Saving the consumer money through decreased

energy use

Engineering- Use sound engineering practices in order to meet

goals and satisfy consumer demands.

System Outline

•Temperature is measured

•Based on User Settings, Room Environment is adjusted

•Control system is used to adjust fan operation, lighting, and electrochromic glass

Thermostat and User Input dials

Control System

Monitors and Adjusts

Room with Electrochromic glass climate and light changes

Deliverables

A model enclosure demonstrating the functionality of the ESCCS

All documentation regarding circuit schematics, parts list, testing results and project costs

User’s manual

System Block Diagram

System Logic

Initialize Read User

Temperature (Tuser)(On default set)

Measure (binary) Current Temperature

(Tcurrent)

Signbit=1 (negative)

ΔVec = + 0.2V

Vec = max ?

Vfan = on10 seconds

Yes

Wait Time

Yes

ΔVec = - 0.2V

No

Wait Time

No

Subtract significant bits Tcurrent -Tuser

Difference = 0

Vec > max/2 ? Signbit=0 (positive)No

Vlight = on Yes

Vlight override

Vec override

Vec = 0V ?

Vec override

on?No

Vlight override

on?

Yes

Vec < max/2 ?

No

Vlight = off

Yes

No

Description of System Logic

After initialization, the current temperature is measured.

The user temperature is compared to the current temperature, and the next action in order to meet the desired temperature is decided based on this comparison.

Wait times are incorporated in order to take into account small temperature changes.

MDR Deliverables

Assembled test enclosure with sensors Interior lighting PV panel Ventilation fan Some preliminary test data Refined plans for remainder of project

Assembled Test Enclosure

Our test enclosure is fully assembled with lighting and fan installed. The sensors have been selected, and we can begin initial testing of heat levels in our prototype living space.

Enclosure Design and Materials

Polyisocyanurate foam insulation sandwiched between ¼ inch plywood.

70 Dergee tilt on front panel

Power system

We decided that in order to minimize our expenses, we would recycle the solar panel and charge controller from an SDP project from two years ago.

Sensor Selection

Our temperature sensors were selected with desired temperature range of 5-35 C with a small error and a low power consumption.

Sensors are digital.

Microchip Selection

Our microchip was selected with low power but with enough pins to collect all necessary data and comparators to calculate the needed changes for our system.

Window Test Data

0

10

20

30

40

50

60

70

80

90

100

0 0.5 1 1.5 2 2.5 3

Volts

% l

igh

t tr

ansm

itte

d

Next Steps

1. Programming

2. Control circuitry1. Windows

2. Fan

3. Light

3. Power circuitry

Problems Encountered

Low fluctuating impedance of variable opacity mirrors.

Digital temperature sensors, uSOP packaging

Questions and Answers